A FIREWALL primarily
Aspeeds up the internet
Bindexes web pages
Ccompresses video streams
Dfilters traffic by rules
Answer & Solution
Correct answer: D. filters traffic by rules
1. FIREWALL: a network security device or software that ENFORCES a security policy on incoming/outgoing traffic.
2. RULES typically based on: source/dest IP, port, protocol, application, time of day, user identity.
3. TYPES:
• STATEFUL: tracks connections; allows return traffic for outbound connections automatically.
• PROXY: terminates the connection, opens a new one to the destination (inspecting in between).
• NEXT-GENERATION (NGFW): adds DPI (deep packet inspection), IDS/IPS integration, app awareness.
4. NOT a complete defense: blocks unauthorised traffic but can't protect against malicious traffic on allowed ports.
_Source: NIST SP 800-12 (Firewalls overview)._
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